She married Otto IV, Duke of Lower Bavaria, son of Stephen I, Duke of Bavaria, with whom she had one child: Albert of Wittelsbach, who was born in 1332.
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Since he had no male heirs, his territory passed to his cousin Theodoric I, who had been appointed Margrave of Meissen when the March of Meissen was reinstated by Emperor Otto IV in 1198.
A new epoch of harmony was expected to begin between the Church and the Holy Roman Empire, as Pope Innocent III had just recognized Otto of Brunswick as Emperor Otto IV of the Holy Roman Empire.
In September 1198 Frederick's younger half-brother Ottokar I made use of the rivalry among Otto IV from the House of Welf and the Hohenstaufen duke Philip of Swabia, youngest son of Emperor Frederick Barbarossa, who both had been elected King of the Romans.
After the early death of her husband, Duke William, in 1213, her brother Emperor Otto IV took over the reign of Lüneburg, as regent for William's son Otto the Child.
Otto IV, Holy Roman Emperor, (1175 or 1176 – 1218), one of two rival kings of the Holy Roman Empire
Otto IV (died 1553), married on 1 February 1541 Countess Palatine Catherine of the Rhine, died childless
This led to many disputes between Otto IV and his half-brother John II from their father's second marriage.
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Count Otto IV of Rietberg (d. 5 or 6 January 1553 outside Metz) was Count of Rietberg from 1535 until his death.
Henry of Northeim, Margrave of Frisia
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Otto was defeated and wounded in battle by Philip on July 27, 1206, near Wassenberg, and as a consequence also lost the support of the pope, who began to favour the apparent winner in the conflict.
However, the Lords of Querfurt, who were Burgraves of Magdeburg, also fielded a candidate.
In 1205 Sicardo returned to Cremona where he supported Frederick II against the Holy Roman Emperor Otto IV of Braunschweig.